Printable Hard Sudoku

Set 1fdwt0p. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
3 9
8 2
5 4 2 3 8
2 4 5 7 9
6 2
9 1
1 3 7 5 4
1 5 3
7 3 6
Hard #2
2 9 7 3
4 6
9 3 6 1 5
7 9 5
7 4 3 5
5 1 2
1
3 8 2 1
8 4 2
Hard #3
1 9 3 4 2
1 5
8 6 7
6 3 8 2
3 2 9 7
2 8 9
5 9 1 3
9
9 6 8
Hard #4
7 3 1 5 9
8 7
1 8
8 1 6 2
7 2 5 8 6
6 3
7 8
9 2 4
8 3 9 5
Hard #5
4 6 5
9 5 2
2 4 9 6
9 6 8
3 8 9 4
1 6 3 2
5 1
7 9 4
6 3 2
Hard #6
4 1 2 8
5 3
7 1 9
8 6 4 5
4 1 9 8 3
3 5
6 7 4
5 8 3
4 2 8
Hard #7
7 4 2
3 5 7 1
8 3 5
4 7 2 6
4 2
6 2 4 3
8 3 7 9
1 5 9
1 6
Hard #8
8 7 2 3 4
3 6 7 1
4 9 5 2
2 8 9
1 5
5 6
7 6 4 2 5
8 9
9 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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